douli6605
2018-03-23 02:14
采纳率: 100%
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time.AddDate()不适用于仅解析时间,并将日期设置为今天吗?

https://play.golang.org/p/O1FWb9O97ld

func main() {
    //const longForm = "Jan 2, 2006 at 3:04pm (MST)"
    t1, _ := time.Parse("03:04:05", "12:03:30")
    fmt.Printf("current date time %v
", t1)
    now := time.Now().UTC()
    t1.AddDate(now.Year(), int(now.Month()), now.Day())
    fmt.Printf("current date time %v", t1)
}

Output current date time 0000-01-01 12:03:30 +0000 UTC current date time 0000-01-01 12:03:30 +0000 UTC

Essentially I parse only time but want to add today's date to it. But nothing changed after calling time.AddDate()

图片转代码服务由CSDN问答提供 功能建议

https://play.golang.org/p/O1FWb9O97ld

  func main(){
 // const longForm =” 2006年1月2日 在3:04 pm(MST)“ 
 t1,_:= time.Parse(” 03:04:05“,” 12:03:30“)
 fmt.Printf(”当前日期时间%v 
“  ,t1)
 now:= time.Now()。UTC()
 t1.AddDate(now.Year(),int(now.Month()),now.Day())
 fmt.Printf(  “当前日期时间%v”,t1)
} 
   
 
 

输出 当前日期时间0000-01-01 12:03:30 +0000 UTC 当前日期时间0000-01-01 12:03:30 +0000 UTC

基本上我只解析时间,但想将今天的日期添加到其中 。 但是在调用时间之后,一切都没有改变。AddDate()

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1条回答 默认 最新

  • douxian6008 2018-03-23 02:36
    已采纳

    AddDate doesn't change the value of the receiver (the receiver isn't a pointer). You need to assign the value to something, e.g.

    t1 = t1.AddDate(now.Year(), int(now.Month())-1, now.Day()-1)
    

    I'm also subtracting 1 from the month and the day since they started out at 1 and 1.

    This is probably a better way to do what you want:

    func main() {
        //const longForm = "Jan 2, 2006 at 3:04pm (MST)"
        t1, _ := time.Parse("03:04:05", "12:03:30")
        fmt.Printf("current date time %v
    ", t1)
        hour, min, sec := t1.Clock()
        now := time.Now().UTC()
        year, month, day := now.Date()
        t1 = time.Date(year, month, day, hour, min, sec, 0, time.UTC)
        fmt.Printf("current date time %v
    ", t1)
    }
    
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